megaspore formation process

microspores are the male gametes whilst megaspore are the female gametes. megaspore also known as megaspore mother cellor megasporocyte. it placed in female cone in the gumnosperm while the microspores placed in the male cone

The triploid nucleus in the megaspore divides to produce endosperm, which provides the plan embryo in the seed with food.

female gametophyte...

Nucellus and MMC are and generally diploid and functional megaspore and female gametophyte are haploid in nature.